/Engine/Plugins/Enterprise/VariantManagerContent/Source/VariantManagerContent/Public/VariantSet.h
Sets the thumbnail to use for this variant set. Can receive nullptr to clear it.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="VariantSet|Thumbnail") void SetThumbnailFromTexture ( [UTexture2D](API\Runtime\Engine\Engine\UTexture2D) * NewThumbnail )